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Ochranata na truda v NRB : planirane na dejnostta za podobrjavane uslovijata na truda
Spasov, Sergi; Maneva, Evdokija - 1983
Persistent link: https://www.econbiz.de/10002844944
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Uslovijata na trud i kačestvoto na zaetostta v Bălgarija : tendencii i vazaimodejstvija
Beleva, Iskra Spasova; Canov, Vasil V.; Velkova, Dočka - 2009 - 1. izd.
Persistent link: https://www.econbiz.de/10003966713